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/* @(#)w_sinh.c 5.1 93/09/24 */

/*

 * ====================================================

 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

 *

 * Developed at SunPro, a Sun Microsystems, Inc. business.

 * Permission to use, copy, modify, and distribute this

 * software is freely granted, provided that this notice

 * is preserved.

 * ====================================================

 */

/*

FUNCTION

        <<sinh>>, <<sinhf>>---hyperbolic sine

INDEX

        sinh

INDEX

        sinhf

ANSI_SYNOPSIS

        #include <math.h>

        double sinh(double <[x]>);

        float  sinhf(float <[x]>);

TRAD_SYNOPSIS

        #include <math.h>

        double sinh(<[x]>)

        double <[x]>;

        float  sinhf(<[x]>)

        float <[x]>;

DESCRIPTION

        <<sinh>> computes the hyperbolic sine of the argument <[x]>.

        Angles are specified in radians.   <<sinh>>(<[x]>) is defined as

        @ifinfo

        . (exp(<[x]>) - exp(-<[x]>))/2

        @end ifinfo

        @tex

        $${e^x - e^{-x}}\over 2$$

        @end tex

        <<sinhf>> is identical, save that it takes and returns <<float>> values.

RETURNS

        The hyperbolic sine of <[x]> is returned.

        When the correct result is too large to be representable (an

        overflow),  <<sinh>> returns <<HUGE_VAL>> with the

        appropriate sign, and sets the global value <<errno>> to

        <<ERANGE>>.

        You can modify error handling for these functions with <<matherr>>.

PORTABILITY

        <<sinh>> is ANSI C.

        <<sinhf>> is an extension.

QUICKREF

        sinh ansi pure

        sinhf - pure

*/

/*

 * wrapper sinh(x)

 */

#include "fdlibm.h"

#include <errno.h>

#ifndef _DOUBLE_IS_32BITS

#ifdef __STDC__

        double sinh(double x)           /* wrapper sinh */

#else

        double sinh(x)                  /* wrapper sinh */

        double x;

#endif

{

#ifdef _IEEE_LIBM

        return __ieee754_sinh(x);

#else

        double z;

        struct exception exc;

        z = __ieee754_sinh(x);

        if(_LIB_VERSION == _IEEE_) return z;

        if(!finite(z)&&finite(x)) {

            /* sinh(finite) overflow */

#ifndef HUGE_VAL 

#define HUGE_VAL inf

            double inf = 0.0;

            SET_HIGH_WORD(inf,0x7ff00000);      /* set inf to infinite */

#endif

            exc.type = OVERFLOW;

            exc.name = "sinh";

            exc.err = 0;

            exc.arg1 = exc.arg2 = x;

            if (_LIB_VERSION == _SVID_)

               exc.retval = ( (x>0.0) ? HUGE : -HUGE);

            else

               exc.retval = ( (x>0.0) ? HUGE_VAL : -HUGE_VAL);

            if (_LIB_VERSION == _POSIX_)

               errno = ERANGE;

            else if (!matherr(&exc)) {

               errno = ERANGE;

            }

            if (exc.err != 0)

               errno = exc.err;

            return exc.retval;

        } else

            return z;

#endif

}

#endif /* defined(_DOUBLE_IS_32BITS) */